Postfix 2.2.1 import.

New features since 2.1.x:
  - built-in IPv6 and TLS (we no longer use patches--beware config changes!)
  - more sophisticated LDAP/MySQL/PostgreSQL support, with freeform queries
  - SMTP client-side connection reuse
  - by default, no longer rewrite message headers in mail from remote clients
  - can use your ISP account name for mail destined outside your machine
  - can selectively turn off ESMTP features in client or server
  - remote SMTP client resource control (the anvil server)
  - support for CDB, SDBM and NIS+ databases is now built into Postfix
  - new SMTP access control features
  - and more
Caution:
  - You MUST stop 2.1.x and earlier versions before upgrading.
  - Use the postfix upgrade program to upgrade your main.cf/master.cf.

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